PHP searches after a few seconds delay

#sleep() function delays the execution of the current script for a few seconds.

Note: If the specified number of seconds is negative, this function will throw an error. (Recommended learning: PHP Video Tutorial) The

usleep() function suspends the thread that calls the function for a period of time. The unit is microseconds (millionths of a second).

//usleep()函数

echo date(&#39;h:i:s&#39;) . "<br />";

//延迟 10 描述
usleep(10000000);

//再次开始
echo date(&#39;h:i:s&#39;);

输出显示：
09:23:14
09:23:24

//sleep() 函数

echo date(&#39;h:i:s&#39;) . "<br>";

//sleep for 5 seconds
sleep(5);

//start again
echo date(&#39;h:i:s&#39;);

输出显示：
09:23:14
09:23:19

Simple PHP search

Add the search statement to the initial query statement; thereby simplifying the code

$news_sql = "SELECT * from books where 1=1 ".$searchAddSql." order by book_number ";

$searchAddSql It is empty at first. If the user enters search conditions, $searchAddSql

will become a string containing the query statement.

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